Canon EOS R5 CR3 RAWs displaying incorrectly

Dear Team,
as FastRawViewer is one of the only Viewers currently supporting CR3 RAWs, i wanted to use it to Cull my RAWs from my new EOS R5.
Unfortunately, despite all efforts, i cannot get it to display the RAWs correctly. They are always flat and wrongly rendered.
See example screenshot below:

I tried every setting regarding color profile or rendering setting, but the images stays as such - it seems like a wrong rendering on a kind of logarithmic color profile.

Anyone has any idea on how to change that?

BTW: The embbeded JPG obviously displays fine, same as the thumbnails.
Thanks for your feedback!

Best regards,
Klaas.